New methods for determination the set of mechanical properties by indentation

Нові методи визначення механічних властивостей матеріалів при індентуванні
Keywords
New substances and materials Mechanical engineering

Description
Determination of mechanical properties such as hardness,Young’s modulus E, fracture toughness KIc, plasticity δH / δA, construction of stress-strain curves and extraction yield stress ss; Poison’s coefficient n, residual stress sr for a lot of materials of various classes (syngle- and polycrystalline metals and ceramics, quasicrystals, amorphous metallic alloys, intermetallics, composites, structural and phase constituents, ceramic and various thing coatings) and especially for which behaviour in conventional tests under tensile and bending is brittle, by local loading of materials with the rigid indenters

Innovative aspect and main advantages:
Possibilities for determination of mechanical properties of low plastic materials by traditional techniques are rather limited due to brittle fracture at stresses close to yield limit and even lower. However, at local loading by rigid indenter even brittle low plastic materials can be deformed to significant strain level without macroscopic fracture. Presently method of local loading of materials with the rigid indenters becomes not only the hardness test, but the very important method of micromechanical testing for determining the set of mechanical properties.

Problem solved:
Only local loading by rigid indenter enables to define yield limit of brittle ceramic materials or to compare with each other plasticity of ceramic materials, which fail brittle at mechanical tests on tension, bending and compression. Only using this method one can investigate the set of mechanical properties of thin coatings and separate phase components of composite materials.
No special-shaped specimens are needed and investigation related to mechanical behaviour and properties of phase and structural constituents of composite materials and thin coatings and very brittle materials become available.

Development status:
Development complete with proven results

Potential customers, markets:
Engineering industry
Material science research organizations,
Material science research and development, R&D

Alternative range of application:
Educational institution in training courses of material science and scientific research